基于成功递送率的编码感知机会路由机制

Coding-aware opportunistic routing based on successful delivery probability

为充分利用无线信道的广播特性,提升网络性能,提出了一种基于成功递送率的编码感知机会路由机制。该机制采用成功递送率替代跳数、期望传输次数等传统路由判据进行路由选择。同时采用转发节点集,允许转发节点集中的所有节点进行编码并按不同的优先级转发数据包,从而避免了传统编码感知的路由方法为获得编码增益'汇聚'数据流所引起的流间干扰、中间节点过载等问题,获得了更高的编码增益。仿真结果表明,该机制能够以增加少量重复数据包为代价获得更多的编码机会,从而有效地提升网络性能。

A successful delivery probability（SDP） based coding-aware opportunistic routing mechanism was proposed.In this mechanism SDP was used as routing metric instead of traditional routing metrics such as hops and expected transmission count（ETX）.Forwarder set was adopted and all the nodes in the forwarder set can perform coding and forward packets according to their priority in a distributed manner.Thus,the problems such as inter-flow interference and overloaded intermediate nodes caused by traditional coding-aware routing protocol can be overcome.Simulation results show that the proposed mechanism can obtain more coding opportunities at the cost of increasing a small amount of duplicates,thus effectively promote network performance.